MIJ 2002 RGR450LTD replacing TRS w/ Floyd Rose Pro Question

[LynchBox]

I have a 2002 MIJ RGR450LTD. It came with the Lo-TRS (1) trem. If I were to replace it with a new Floyd Rose Pro, what size would I need (as in R2,R3,R4, or R5)? I know R3 & R4 for the same size but one is thin spacing & the other is wide. I'm not much of a tech and will have it installed by a luthier but I want to order the right part first if I decide to replace the TRS. Also, is there any mods required if I chose to go w/a Gotoh? I know with the Floyd there are none. If I go with a Gotoh, is there a size I should go with as well? Thanks & below is a link to my guitar if that helps:

http://www.ibanez.com/parts/2002_PAR...del_flame.html

(click on RG series & scroll to RGR450LTD - BC - 3rd guitar up from the bottom)

[albee1952]

The R3, R4 etc, refers to the nut spacing so if you leave the locking nu alone, you can ignore that choice. If you want to change the nut for color reasons, R3 or R4 should both fit(43mm is the Ibanez RG neck width at the nut). As for the bridge itself, there may be some routing involved.